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  4. In the figure shown, the coefficient of static friction between the block A of mass 20 kg and horizontal table is 0.2. What should be the minimum mass of hanging block just beyond which blocks start moving?

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Q. In the figure shown, the coefficient of static friction between the block $A$ of mass $20\, kg$ and horizontal table is $0.2$. What should be the minimum mass of hanging block just beyond which blocks start moving?Physics Question Image

Laws of Motion

Solution:

Tension produced in the string should be just greater than the frictional force acting on the $20\, kg$ block
$T=m_{B} g$
$T > \mu m_{ A } g$
$m_{B} g > (0.2)(20(g)$
$m_{B} > 4\, kg$